7 window replacement contractors Based in Sterling
Sterling has 7 window replacement contractors on active state license records. The oldest of them has held a window or glazing license since 1991, and the median listing has carried one for 20 years.
Licenses checked · Virginia Department of Professional and Occupational Regulation, Board for Contractors
4AIECC climate zone · ENERGY STAR North-Central zone
What Sterling's climate means for your window spec
Sterling sits in IECC climate zone 4A, the starting point for any code-minimum window performance here.
ENERGY STAR places Loudoun County in its North-Central zone for window certification.
Normal temperatures run 33°F in January and 77°F in July, so the glass package worth paying for in Sterling isn't the same one that pencils out two zones over.
Data: U.S. EPA / DOE, ENERGY STAR, ENERGY STAR Version 7.0 Climate Zones by County/ZIP (Windows, Doors, and Skylights) (V7.0); Pacific Northwest National Laboratory (DOE Building America), Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270) (2021 IECC), from the nearest NOAA station 4.8 mi away.
20median years licensed
The license record behind these listings
The median window license active in Sterling has been on the books for 20 years.
A small slice, 0 of them, sit inside a 90-day window for renewal as of our last check, which is ordinary license-cycle timing rather than a mark against the business.
Match the number on any Sterling listing here against Virginia's own lookup before you pick up the phone.
Data: Virginia Department of Professional and Occupational Regulation, Board for Contractors license records, checked 2026-09-30.
Window contractors licensed to work in Sterling, VA
Listed A to Z by business name. No listed business paid for placement or position.
| Business | Category | License class | License no. | Status | Effective | Expires | ZIP | Official record |
|---|---|---|---|---|---|---|---|---|
| Capitol Glass And Metals LLC | Window and glass contractor | Class A – Glass and Glazing Contracting (GLZ) | 194228 | Active | Jun 20, 2025 | Jun 30, 2027 | 20166 | Verify license |
| Design Glazing Concepts LLC | Window and glass contractor | Class A – Glass and Glazing Contracting (GLZ) | 091822 | Active | Feb 4, 2005 | Feb 28, 2027 | 20166 | Verify license |
| Enclosures Unlimited Incorporated | Window and glass contractor | Class A – Glass and Glazing Contracting (GLZ) | 005426 | Active | Oct 28, 1991 | Mar 31, 2028 | 20164 | Verify license |
| Executive Glass Services INC | Window and glass contractor | Class A – Glass and Glazing Contracting (GLZ) / Commercial Improvement Contracting (CIC) | 087121 | Active | Jul 21, 2004 | Jul 31, 2028 | 20165 | Verify license |
| Modern Glass Designs INC | Window and glass contractor | Class A – Glass and Glazing Contracting (GLZ) | 196905 | Active | Jun 25, 2026 | Jun 30, 2028 | 20166 | Verify license |
| S & K Roofing Siding And Windows INC | Window and glass contractor | Class A – Home Improvement Contracting (HIC) | 105665 | Active | Aug 9, 2006 | Feb 29, 2028 | 20166 | Verify license |
| Window And Door Showplace INC | Window and glass contractor | Class A – Home Improvement Contracting (HIC) | 133400 | Active | Mar 11, 2010 | Mar 31, 2028 | 20166 | Verify license |
Questions to ask before you sign
- How long have you held your state license, and can I see the number?
- Is this a full-frame replacement or an insert into my existing frame, and why that one?
- Who pulls the permit, and does this change trigger an egress check on a bedroom window?
- What flashing and sill pan will you use, and in what order do you install them?
- If my home was built before 1978, is your crew lead-safe certified for this job?
- What's the completion date in writing, and what happens if the schedule slips?